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Is there a relationship between the race of violent offenders and their victims? Data from the U.S. Department of Justice (Expanded Homicide Data Table 5, 2007) are presented below:Characteristics of OffenderCharacteristics of Victim White Black OtherWhite 2,918 566 51Black 245 2,905 11Other 50 25 95a) Let's treat race of offenders as the independent variable and race of victims as the dependent variable. If we first ignore the independent variable and try to predict race of victim, how many errors will we make?b) If we now take into account the independent variable, how many errors of prediction will we make for those offenders who are white? Black offenders? Other offenders?c) Combine the answers in (a) and (b) to calculate the proportional reduction in error for this table based on the independent variable. How does this statistic improve our understanding of the relationship between the two variables?
Using the .05 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing.
Use the table to determine whether the correlations are significant and how you would interpret the results. The correlation between speed and strength for 20 women is .567. Test these results at the .01 level using a one-tailed test.
A company is creating 5 new divisions and 8 managers are eligible to be appointed head of a division. With 8 managers trying for 5 jobs, how could the five new heads be arranged?
Describe a specific application of statistics that either has a direct effect on you or your life.
A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n= 25 third grade children and each child is given a standardized achievement test at the end of the year.
How many books should be tested to estimate with 95% to within 0.1 lb, the average force required to break the binding? Assume that sd is known to be 0.8 lb.
A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error?
Compute the Expected Value (Mean), The Variance, and The Standard Deviation for this random variable. X 1 2 3 4 5 6 7
Extreme value or is it a fairly typical sample mean? For a sample of n=36 scores, would a sample mean of M=55 be considered an extreme value or is it is fairly typical sample mean?
What is correlation analysis? How can correlation analysis be used in a business decision or examples specifically related to strategy formulation and implementation?
Consider the continuous random variable X, which has a uniform distribution over the interval from 20 to 28. The probability that X will take on a value between 21 and 25 is.
Use value you found in part a to find out degree of confidence for interval 65.65
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